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The best in its class gets better
It's 28% lighter than its predecessor. That fact alone would make this long, fast lens worth snapping up. But that's only part of the story. This Canon L Series flagship lens also features the advanced, three-mode image stabilization technology that's made it a favorite of nature and sports photographers everywhere. Whether you're on the far side of the stadium before the clutch field goal, or trying to isolate that rare egret perched on a branch in the marsh, this lens features the reach, the stability, and the light-gathering capacity for your most challenging assignments.

A distinguished optical pedigree
In order to give clarity and sharpness to every subject, the lens features some of the world's most advanced optics: Fluorite elements to reduce chromatic aberration. Subwavelength Structure Coating to reduce flaring and ghosting. Fluorine coatings on the front and back elements for dirt, oil, and water resistance. Your work will be virtually free of distortion and color fringing. Canon has put its innovation to work in making a lens that sets the standard for its class while being highly portable.

Whether you're a working pro or an advanced photo enthusiast, you'll be sure to appreciate the thought and workmanship that went into the making of this lens every time you capture the perfect shot. It makes one of the toughest challenges in photography — capturing action from a distance — a piece of cake.

Preliminary info from the manufacturer

Features and Specs

Product Research

Features

Overview: The Canon EF400mm f/2.8L IS II USM lens is a
high-performance super-telephoto lens for use with Canon EOS cameras. The lens features
a built-in Image Stabilizer (IS), as well as an Ultrasonic Motor (USM). The lens is constructed of
16 elements (including Ultra-low Dispersion UD glass, fluorite, and aspherical
elements) in 12 groups for truly exceptional imaging capability.

Focus Modes: The EF400 lens is equipped with a three-way
switch for setting the Focus Mode. You can choose from AF (auto focus), PF
(power focus), or MF (manual focus). In Manual Focus mode, you can focus on your
subject by turning the focus ring. The Power Focus mode allows you to change the
focus at a set speed--a useful feature for changing focus when shooting movies.

Focus Preset: By presetting any focusing distance, you can
instantly focus at that point even while you are shooting a different subject.
The Focus Preset switch on the side of the lens barrel lets you turn the feature
on or off, while the Set button is for setting the preset focus distance.

Image Stabilizer II (IS II): The new built-in Image Stabilizer
II can be used in the AF (autofocus), PF (power focus), or MF (manual focus) modes. The Image Stabilizer gives the equivalent effect of a shutter speed
four
stops faster. Two switches located on the barrel of the lens allow you to turn the image stabilizer on and off, and switch between
the three stabilizer modes:

Mode 1: used for normal photography; corrects
vibrations in all directions

Mode 2: corrects vertical camera shake during following
shots in a horizontal direction; also corrects horizontal camera shake
during following shots in a vertical direction.

Mode 3: corrects vibration only during exposure. During
panning shots, corrects vibration during exposure only in one direction (the
same as Mode 2).

Focusing Ring: Regardless of whether you're in manual or auto focus mode, the focusing ring always works. This means you can auto focus on a subject, but manually change the focus by turning
the focusing ring.

Focus Range Switch: You can switch between two focusing ranges using the three-way switch on the barrel of the lens. You can choose
from Full, a range of 2.7-7 meters (8.9-23') to
infinity, or a range of 7 meters (23') to infinity. Depending on your subject matter, the correct choice of focus range can reduce the
auto focusing time.

Lens Hood/Tripod Mount: The included ET-155 lens hood cuts
out unwanted light and protects the lens from
rain, snow, and dust. You can reverse-mount the lens hood on the lens for storage. The tripod mount allows you to mount the camera onto a tripod by the lens instead of the camera body. The
orientation locking knob
can be loosened to allow you to quickly change between vertical and horizontal positions.

Optional Lens Extenders: The lens is compatible with EF1.4x
II/III and EF2x II/III lens extenders (sold separately). The extenders will
increase the focal length to 560mm (EF1.4x) and 800mm (EF2x).

Optional Filters: The EF400mm lens has a built-in 52-series
(WII) drop-in gelatin filter holder with a glass filter. An optional Drop-in
Screw-type Filter Holder and a Drop-in Circular Polarizing Filter are sold
separately.

Specifications:

Focal Length: 400mm

Minimum Aperture: f/32

Maximum Aperture: f/2.8

Minimum Focus Distance: 8.9 feet

Angle of View:

Diagonal: 6° 10'

Vertical: 3° 30'

Horizontal: 5° 10'

Dimensions: 6.4" Diameter, 13.5" Length,
135.8 Ounces

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The ultimate field sports lens - Canon raises the bar

I purchased the EF 400 f/2.8L IS II USM to replace my very capable EF 400 f/2.8L IS. Right out of the box, the weight difference is simply staggering. This lens is quite handholdable for me. I weighs 3.36 lb less than the prior version. It is .01 lb lighter than the EF 500 f/4L IS, a lens I've handheld without any problems. The second thing I noticed is the tremendous improvement in the lens mounting collar. When mated to a 1D the lens rotation is now buttery smooth. Last but certainly not least is the improvement in optical performance. The sharpness is better and the image quality (IQ), to my eye, is improved. I would say the overall performance gains are similar to the 70-200 IS II vs. the prior version. It is not quite as pronounced but it is quite obvious to me. Also, I am finding the performance with the EF 1.4x II and EF 2x II extenders is a bit better. It does focus faster and the image quality is noticeably better. I have an EF 1.4x III on the way which I hear provides a bit better performance.

Pros:lighter weight, optical performance, IQ, improved ergonomics

Cons:Cost - These new Canon prices are just ridiculous. I sold a pristine EF 400mm f/2.8L IS and a EF 600mm f/4L IS just to pay for this monster.